src/regex/regerror.c

   1 #include <sys/types.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <ctype.h>
   5 #include <limits.h>
   6 #include <stdlib.h>
   7 #include <regex.h>
   8
   9 #include "utils.h"
  10 #include "regerror.ih"
  11
  12 /*
  13  = #define      REG_OKAY         0
  14  = #define      REG_NOMATCH      1
  15  = #define      REG_BADPAT       2
  16  = #define      REG_ECOLLATE     3
  17  = #define      REG_ECTYPE       4
  18  = #define      REG_EESCAPE      5
  19  = #define      REG_ESUBREG      6
  20  = #define      REG_EBRACK       7
  21  = #define      REG_EPAREN       8
  22  = #define      REG_EBRACE       9
  23  = #define      REG_BADBR       10
  24  = #define      REG_ERANGE      11
  25  = #define      REG_ESPACE      12
  26  = #define      REG_BADRPT      13
  27  = #define      REG_EMPTY       14
  28  = #define      REG_ASSERT      15
  29  = #define      REG_INVARG      16
  30  = #define      REG_ATOI        255     // convert name to number (!)
  31  = #define      REG_ITOA        0400    // convert number to name (!)
  32  */
  33 static struct rerr {
  34         int code;
  35         char *name;
  36         char *explain;
  37 } rerrs[] = {
  38         { REG_OKAY,     "REG_OKAY",     "no errors detected" },
  39         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
  40         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
  41         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
  42         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
  43         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
  44         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
  45         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
  46         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
  47         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
  48         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
  49         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
  50         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
  51         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
  52         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
  53         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
  54         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
  55         { -1,           "",             "*** unknown regexp error code ***" },
  56 };
  57
  58 /*
  59  - regerror - the interface to error numbers
  60  = extern size_t regerror(int, const regex_t *, char *, size_t);
  61  */
  62 /* ARGSUSED */
  63 size_t
  64 regerror(errcode, preg, errbuf, errbuf_size)
  65 int errcode;
  66 const regex_t *preg;
  67 char *errbuf;
  68 size_t errbuf_size;
  69 {
  70         register struct rerr *r;
  71         register size_t len;
  72         register int target = errcode &~ REG_ITOA;
  73         register char *s;
  74         char convbuf[50];
  75
  76         if (errcode == REG_ATOI)
  77                 s = regatoi(preg, convbuf);
  78         else {
  79                 for (r = rerrs; r->code >= 0; r++)
  80                         if (r->code == target)
  81                                 break;
  82
  83                 if (errcode&REG_ITOA) {
  84                         if (r->code >= 0)
  85                                 (void) strcpy(convbuf, r->name);
  86                         else
  87                                 sprintf(convbuf, "REG_0x%x", target);
  88                         assert(strlen(convbuf) < sizeof(convbuf));
  89                         s = convbuf;
  90                 } else
  91                         s = r->explain;
  92         }
  93
  94         len = strlen(s) + 1;
  95         if (errbuf_size > 0) {
  96                 if (errbuf_size > len)
  97                         (void) strcpy(errbuf, s);
  98                 else {
  99                         (void) strncpy(errbuf, s, errbuf_size-1);
 100                         errbuf[errbuf_size-1] = '\0';
 101                 }
 102         }
 103
 104         return(len);
 105 }
 106
 107 /*
 108  - regatoi - internal routine to implement REG_ATOI
 109  == static char *regatoi(const regex_t *preg, char *localbuf);
 110  */
 111 static char *
 112 regatoi(preg, localbuf)
 113 const regex_t *preg;
 114 char *localbuf;
 115 {
 116         register struct rerr *r;
 117
 118         for (r = rerrs; r->code >= 0; r++)
 119                 if (strcmp(r->name, preg->re_endp) == 0)
 120                         break;
 121         if (r->code < 0)
 122                 return("0");
 123
 124         sprintf(localbuf, "%d", r->code);
 125         return(localbuf);
 126 }